Transfer From Normal To Bypass Mode; Transfer From Bypass To Normal Mode - Eaton Powerware 9390 Installation And Operation Manual

8. Observe the following messages appear sequentially on the power module (PM)
status line:
DC STARTING
INVERTER STARTING
INVERTER SYNCING
READY
The rectifier and inverter turn on. When the inverter reaches full voltage, the UPS
is ready to transfer to the Normal mode and supply the critical load.
9.1.4

Transfer from Normal to Bypass Mode

To transfer the critical load to Bypass mode:
In Bypass mode, the critical load is not protected from commercial power interruptions and abnormalities.
1. Press the CONTROLS pushbutton on the main menu bar. The System Controls
screen appears.
2. Press the BYPASS pushbutton on the System Controls menu bar.
The UPS transfers to Bypass mode and the critical load is immediately supplied
by the bypass source. If the bypass source is not available, the power processor
remains on and an alarm sounds.
3. The UPS is now operating in Bypass mode and the BYPASS status indicator is
illuminated.
The power module (PM) status indicates READY. The system is now on bypass
and the UPS power processor remains on.
Power is present inside the UPS cabinets.
9.1.5

Transfer from Bypass to Normal Mode

To transfer the critical load to Normal mode:
1. Press the CONTROLS pushbutton on the main menu bar. The System Controls
screen appears.
2. Press the NORMAL pushbutton on the System Controls menu bar.
The UPS transfers to Normal mode. If the power processor is not available, the
system remains on bypass and an alarm sounds.
3. The UPS is now operating in Normal mode, and the NORMAL status indicator is
illuminated.
The
®
EATON Powerware 9390 UPS (20–80 kVA) Installation and Operation Manual
us indicates
power module (PM) stat
UPS OPERATING INSTRUCTIONS
C A U T I O N
W A R N I N G
ONLINE.
S
164201603 Rev 2 www.powerware.com
9-3